mirror of
https://github.com/kelvinlawson/atomthreads.git
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dfb831fa63
Added platforms directory. Added QEMU qemu_integratorcp platform in platforms. Modified test cases to make stack top DWORD aligned.
116 lines
3.4 KiB
C
116 lines
3.4 KiB
C
/*
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* Copyright (c) 2012, Natie van Rooyen. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. No personal names or organizations' names associated with the
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* Atomthreads project may be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE ATOMTHREADS PROJECT AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "modules.h"
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#include <stdio.h>
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#include <stdarg.h>
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#include "atomport_private.h"
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#include "atom.h"
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#include "atomport.h"
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#include "types.h"
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ICP_TIMER_T* const board_timer_0 = (ICP_TIMER_T*) BOARD_BASE_ADDRESS_TIMER_0 ;
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ICP_PIC_T * const board_pic = (ICP_PIC_T*) BOARD_BASE_ADDRESS_PIC ;
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/**
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* \b dbg_format_msg
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*
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* Same as printf.
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*
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*/
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void
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dbg_format_msg (char *format, ...)
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{
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va_list args;
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static char msg[256] ;
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CRITICAL_STORE ;
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va_start (args, format) ;
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CRITICAL_START() ;
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vsnprintf ((char*)msg, 256, (char*)format, args) ;
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CRITICAL_END() ;
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printf (msg) ;
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}
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/**
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* \b low_level_init
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*
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* Initializes the PIC and start the system timer tick intrerupt.
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*
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*/
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int
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low_level_init (void)
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{
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board_pic->IRQ_ENABLECLR = ICP_PIC_IRQ_TIMERINT0 ;
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board_timer_0->INTCLR = 1 ;
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board_pic->IRQ_ENABLESET |= ICP_PIC_IRQ_TIMERINT0 ;
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board_timer_0->LOAD = 0x2000 ;
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board_timer_0->BGLOAD = 0x2000 ;
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board_timer_0->CONTROL = ICP_TIMER_CONTROL_ENABLE |
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ICP_TIMER_CONTROL_MODE |
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ICP_TIMER_CONTROL_IE |
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/*ICP_TIMER_CONTROL_PRESCALE_256 |*/
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ICP_TIMER_CONTROL_TIMER_SIZE ;
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return 0 ;
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}
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/**
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* \b __context_preempt_handler
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*
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* System timer tic interupt handler.
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*
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*/
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void
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__context_preempt_handler (void)
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{
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unsigned int status = board_pic->IRQ_STATUS ;
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if (status | ICP_PIC_IRQ_TIMERINT0) {
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atomIntEnter();
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/* Call the OS system tick handler */
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atomTimerTick();
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/* ack the interrupt */
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board_timer_0->INTCLR = 0x1 ;
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/* Call the interrupt exit routine */
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atomIntExit(TRUE);
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}
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}
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